基于DSP的数字锁相环的设计

摘要

研究了锁相环的原理、建模和参数设计,分析了传统锁相环电路对无互联线逆变电源的鉴相误差影响,利用数字锁相的概念设计了一种基于DSP的全数字化软件的锁相环.通过仿真实验证实,采用数字锁相环能够快速平稳地实现逆变电源并联的相位和频率的跟踪,能实现无互联线逆变电源的并联,同时保持了相位、频率和幅值基本达到一致.%This paper focused on the principle of phase-locked loop (PLL) , and introduced the modeling and parameter design in detail. The traditional PLL which influenced the phase demodulation errors of inverters with no control interconnection were studied. Meanwhile, it designed a digital phase-locked loop ( DPLL) based on DSP using the concept of digital phase-locking. The tracking of the phase and frequency in paralleled inverter can be realized effectively and rapidly by using DPLL. Besides, the parallel operation of inverters with no interconnection is solved. The simulation data of this method keep consistent with the phase, frequency and amplitude. The efficiency of the DPLL was proven by experiments and simulations.